It appears you have a non-HE bolt, but an HE bolt guide; unless you got two bolt kits.
If you can't find a replacement ring for the feedneck, it's Ion threaded and replacements can be had just about anywhere.
It looks like you've got a decent start on the build.
That body looks somewhat sexy as is.

Using a gun that's been hardly maintained and tossed from person to person more than a village whore is hardly a fair way to compare the marker.

it's really good that you say that about the bolt guide, because I picked up another bolt engine with an HE bolt and non HE guide (:

I'll take pics of where I am at in a bit (:

Both of your bolt guides are HE. Not 100% sure, but it looks like you have one HE can and one sft can. You can tell HE bolt guides by the fact that they have a smaller radius between the two orings. As for cans, the HE can's front piece pops off, while the sft can is just 1 piece.

This is the standard non HE guide:

If you want to get sponsored, present yourself as a mature adult, not a four year old with a crayon.

If you look in the front, you should be able to tell quite easily. If it's an SFT can, there's no inner lip right after the air transfer holes, if it's an HE can, then it's got that lip after the holes that seals against the HE o-ring on the HE bolt.